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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

An open circulatory system. An open circulatory system.
Female Reproductive System Female Reproductive System
Anatomy of the urinary system. Anatomy of the urinary system.
The Pathophysiology of Glaucoma (A) Slowing Rising Intraocular Pressure (I O P) The Pathophysiology of Glaucoma (A) Slowing Rising Intraocular Pressure (I O P)
Overview of the components of the human digestive system, together with a brief description of their Overview of the components of the human digestive system, together with a brief description of their
Change in Blood Pressure through the Systemic Circuit Change in Blood Pressure through the Systemic Circuit
Video: Action potentials - electrical characteristics and generation

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